Finding the Fourth Proportional to 1,111.78, 1,666.19 and 527.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.78 : 1,666.19 = 527.05 : x
2. Step 2: Convert to fraction form
   1,111.78/1,666.19 = 527.05/x
3. Step 3: Cross multiply
   1,111.78x = 1,666.19 × 527.05
4. Step 4: Simplify right side
   1,111.78x = 878,162.80
5. Step 5: Solve for x
   x = 878,162.80/1,111.78
6. Step 6: Final answer
   x = 789.87